Add POSIX character class support to globset #3210
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Implement support for POSIX character classes like [:space:], [:digit:], [:alpha:], etc. in glob patterns. All 12 standard POSIX classes are supported: alnum, alpha, blank, cntrl, digit, graph, lower, print, punct, space, upper, and xdigit. The implementation uses ASCII-only definitions to avoid locale-dependent behavior. POSIX classes can be used alone or combined with regular character ranges (e.g., [[:digit:]a-f] for hexadecimal digits). Fixes BurntSushi#2962
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Implement support for POSIX character classes like [:space:], [:digit:], [:alpha:], etc. in glob patterns. All 12 standard POSIX classes are supported: alnum, alpha, blank, cntrl, digit, graph, lower, print, punct, space, upper, and xdigit.
The implementation uses ASCII-only definitions to avoid locale-dependent behavior. POSIX classes can be used alone or combined with regular character ranges (e.g., [[:digit:]a-f] for hexadecimal digits).
Fixes #2962